Four Month Sleep Regression

sleep regression


Your Baby Sleep Consultant expert.

If you have landed here, chances are you are dealing with the challenging four-month sleep regression or gearing up for it. Firstly, take a deep breath – there’s hope on the horizon. As a Professional Baby Sleep Consultant in Syndey, I have assisted thousands families in navigating through this tricky sleep regression. In my programs, in just a few days to a week, I have taught all of these babies how to start sleeping for 10 hours overnight (still allowing for necessary overnight feeds). This guide aims to provide you with insights into the what’s, why’s, and most importantly, the how’s of the four-month sleep regression. Below, discover my top tips and tricks to help you and your little one overcome this challenging period and get some much-needed sleep!

What is the four-month sleep regression?

The four-month sleep regression is a period of time, lasting anywhere from two to six plus weeks, when your baby is going through a change in their sleep patterns. It can start as early as ten weeks to as late as five months old. You might find your baby suddenly waking frequently during the night (sometimes every 45 minutes – especially after 12 am) or resisting sleep in general when they used to sleep well. Some other signs include changes in appetite, short naps or ‘cat-napping’, and fussiness.

Since this is the first sleep regression your baby will experience, it can be the hardest to deal with. The good news is, it’s all because your baby is growing and gaining a new level of awareness, so they are more curious about their world! I like to call this ‘regression’ a PROGRESSION! 

The science behind it

At four months of age, your baby will need approximately twelve to fifteen hours of sleep over a twenty-four hour period. This means a four to six-month-old baby will have around ten to eleven hours of sleep during the night, and usually two overnight feeds.

The four-month sleep regression is linked to a permanent change in your baby’s sleep cycle where they will start to experience more time in a non-REM sleep stage, causing them to wake up more frequently.

As a newborn, your baby’s sleep comprised of 50% REM sleep. Now your baby is older, they starting to move onto sleep cycles of 25% REM sleep so they’re able to make room for the other sleep stages. Even though their REM sleep is lighter than an adult’s, the new sleep stages added to their cycle are lighter than what they’re used to. As a result, there’s a higher chance your baby will wake up as they settle into sleep. 

Not to mention, this sleep regression might coincide with developmental milestones such as learning to roll over and early stages of teething; all of which will cause your baby to wake more frequently.

Can I avoid the four-month sleep regression?

The short answer is: no. It is an inevitable and permeant change as it’s part of your baby’s development and their changing sleep cycle. However, it doesn’t have to be a waking nightmare! There are ways to prepare for the sleep regression and to manage it.

Managing the four-month sleep regression:

1.) Give Time to Practise New Development Milestones During the Day 

If your baby has discovered a new skill, such as rolling over, it might be keeping them up at night as they try to practise it. By giving your baby time to practise their new developmental skill during the day, they won’t spend all their nights trying to learn it!

2.) Slowly Break Sleep Associations

While this step works best in preparation of the four-month sleep regression, it can also work once the sleep regression starts. Often a baby falls asleep while being nursed or held. As a result, a sleep association is created, where your baby will associate being held while sleeping. Try to slowly break these sleep associations by replacing them with new ones that don’t require your presence.

3.) Put Your Baby Down Drowsy

When your baby is drowsy, put them in their cot right away rather than waiting until they are asleep. This will help teach your baby how to sleep on their own and will help break any sleep associations they’ve made.

4.) Full Feeds During the Day

As your baby is more curious about the world around them, you might notice their attention shifting away from feeding. This can lead to your baby finishing feeding before they’re actually full, so make sure to feed your baby in an environment where they can feed effectively. Full feedings during the day and before bed can help prevent your baby from being hungry at night. A dream feed (feeding while your baby is sleeping) might help as well!

5.) Adjusting Bedtime 

When a baby is overtired, they can resist sleeping A LOT (similar to when adult’s get a second wind at night). Try to adjust your baby’s nap or bedtime, so they are going down before that overtired state.

6.) Ask for help!

This baby sleep regression can be an especially exhausting time; in order to take care of your baby, you have to take care of yourself too. If you have a partner, family or friends who are willing to help, let them! Try to switch night shifts or even have someone watch over your little one during the day so you can get some much needed rest. If you find yourself unable to get through the four-month sleep regression, get in touch with a professional (My NewBorn) Baby Sleep Consultant in Sydney and I will be in contact shortly to help you get some structure and sleep back into your life.

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Terms & Conditions

Jennifer is a qualified IMI Maternity and Child Sleep Consultant, Doula and MNT Maternity Nurse. These qualifications enable her to assist pregnant women with their sleep issues, support women during labour and the birthing process, guide parents during the postpartum period and educate families about their baby’s sleeping habits. Jennifer provides safe and gentle sleep training methods based on knowledge obtained during her studies, successful qualifications and 16+ years experience.

Jennifer has obtained her paediatric First Aid Training through KidZAid and is registered to work with babies and children in Australia and Europe. Techniques and methods used are all derived directly from her qualifications and from her many years of experience.

Jennifer’s advice does not replace the advice from your Doctor or Paediatrician, and her advice should not be relied upon as medical advice. For medical advice, you should always seek the advice from your medical practitioner. Therefore, you should consult with your health-care professional should you have any healthcare related questions or before embarking on a new sleep program. If a medical problem appears or persists, do not disregard or delay seeking medical advice from doctor. Accordingly, Jennifer expressly disclaims any liability, loss, damage, or injury caused by information provided to the client.

Jennifer will educate, support you and guide you through the sleep challenges needed to make change in your baby’s sleeping habits. As a Baby Sleep Consultant, Jennifer is not responsible for your application of the sleep solutions once the consultation has concluded. Once the sleep consultation has concluded it is the responsibility of the parent(s) to apply the agreed methods and solutions. Jennifer has an extremely high success rate, however, the success of Jennifer solutions is in the hands of the parents’ commitment & perseverance once the sleep consultation has ended; therefore Jennifer cannot make any guarantees of success. However, Jennifer will use her best endeavours to support you until the desired result has been achieved.

  • I agree to check with my healthcare provider/doctor if my baby has any medical conditions, which prevent them from being trained safely.
  • I agree to follow safe sleeping practices in line with SIDS recommendations (
  • I agree to disclose any medical conditions to Jennifer, which my baby has or has had previously.
  • I understand that my customised baby sleep program is meant for my baby only and should not be shared with a third party. I acknowledge the information might not be suitable for another baby.
  • Any changes I make to my baby’s sleeping or eating arrangements are my decision and Jennifer will only make suggestions for change, of which I am responsible for choosing to implement.
  • It is my responsibility to contact Jennifer for my follow up support and send the sleep log information through to be assessed for feedback as frequently as suggested.


In-Home Cancellation Policy
To confirm any In-Home Program, the client will be required to pay a 25% non-refundable deposit to secure the booking. The remaining amount of the In-Home Program will be required to be paid on the day after Jennifer leaves your home. Any cancellations barring medical or other emergencies will forfeit the deposit. If  you cancel less than 48 hours before the scheduled visit, the full amount will be required, unless Jennifer can backfill your place with someone on the waiting list.

If your baby is a little under the weather and does not have a temperature, the program can generally proceed as planned. If your baby is sick with a temperature or has been diagnosed with a medical condition by a doctor, the program will be postponed until your baby is better. A doctors certificate may be requested.

Remote Program/Phone Consultation
To confirm the Remote Program or Phone Consultation Jennifer will be required to be paid in full before sleep plans are constructed and the phone consultation takes place.

Remote Program Cancellation policy
The Remote Program and Phone Consultations are non-refundable after the start of sleep work (i.e. when any sleep advice has been delivered to the client via email, text, phone).

Acts of God or suspected medical conditions
If an act of God, such as a fire, flood, earthquake or other natural calamity shall cause you to cancel the sleep services, Jennifer will require payment only for the time actually spent sleep consulting. 

If during the In Home program, Jennifer feels the consultation should cease due to an underlying or undisclosed medical condition, Jennifer will require payment only for the time actually spent in your home. In this case, to keep the situation fair on both parties, the hourly rate is reduced down from the normal sleep consulting fees (as per the program booked) and charged at $50ph. 

Doctor’s appointment
Jennifer requests that every client has an appointment with their doctor to ensure their baby is developmentally on track and fit for sleep training. Written medical approval may be requested for certain circumstances.

Within 25km from Bondi Beach. An additional fee of $25ph travelled will be charged if travel is over 25kms.

As the client, you knowingly and voluntarily agree to waive and release Jennifer from any and all claims of liability or demands for compensation that you may acquire during the time working with Jennifer.

By checking this Agreement, you agree to the terms and conditions detailed within.